How do I use BBCode to create a vertical/horizontal text gradient?

I want to change the colour from the bottom of the text to the top. Some might call this a horizontal gradient even.:) Is this possible?

Cheeers

Not with BBcode, but you can do this with a blend mode or create a spritefont with this gradient.

It's already spritefont but I don't want to manually paint the colour in as I want to change it in code(ideally).

I really want the gradient to go from something like yellow to red but I cant use a blend mode because blend modes seem too slow for my target device.

Never mind, if its not possible I guess I'll stick with a solid colour then.